7
practice examMultiple Choice

Practice Exam

Question 7 • Chemistry

Which statement describes the law of conservation of energy?

Answer
A
All systems will exchange matter and energy with their surroundings.
B
Energy is destroyed in most chemical reactions when new products are formed.
C
Energy cannot be created nor destroyed, but it changes from one form to another.
D
All systems can exchange energy, but not matter, with their surroundings.

Explanation

The law of conservation of energy states that energy cannot be created or destroyed; it can only be transferred or transformed into another form. For example, chemical energy may change into heat and light during a reaction, but the total energy is conserved. Therefore, the correct statement is “Energy cannot be created nor destroyed, but it changes from one form to another.”

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